Device for converting reciprocating into rotary motion



(Model. 2 Sheets-Sheet 1.

F. J AOKSON.

DEVICE FOR CONVERTING REGIPROOATING INTO ROTARY MOTION.

N0. 519,064. v Patented May I 1894.

Wroess as (ModeL). 2 SheetsSheet 2. v

F. JACKSONQ DEVICE FORZOONVERTING RBOIPROOATING INTO ROTARY MOTION; No. 519,064 Patented May 1, 1894.

" UNITED STATES I PATENT OFFICE.

FRANCIS JACKSON, OF RAISINVILLE, MIOHIGAN.

DEVICE FOR CONVERTING RECIPROCATING INTO ROTARY MOTION.

SPECIFICATION forming part of Letters Patent No. 519,064, dated May 1, 1894. Applioationfiled April 28, 1893. Serial No. 472,162. (Model) To all whom it may concern:

Be it known that I, FRANCIS JAoKsoN, a citizen of the United States, residing at Raisinville, in the county of Monroe and State of Michigan, have invented certain new and useful Improvements in Devices for Converting a Reciprocating into a Rotary Motion, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention consists in the peculiar construction, arrangement and combination of the various parts.

In the drawings, Figure 1 is an elevation of my improved device showing it applied in connection with a treadle or foot power as used on a sewing machine. Figs. 2 and 3 are diagram elevations of the levers, and movable fulcrum frames, showing the parts in different positions. Fig. 4 is a section on the line a: 00 of Fig. 5, showing the parts in the position indicated in dotted lines in Fig. 5. Fig. 5 is an enlarged elevation showing in full and dotted lines different positions of the parts.

This invention is an improvement upon my present Patent No. 337,956, of March 16, 1886,

and is intended to overcome some of the objections to the device therein patented, one being that in that device with a single lever there was a point in which the crank would be upon a dead center, while in this device with the two levers there is no point in which the crank can be arranged at a dead center. Another advantage is that in that device a separate operating mechanism was required for moving the fulcrums into the paths of the actuating levers, while in my present device the fulcrum frames are actuated by the levers themselves. In both constructions I attain an entire revolution of the crank shaft to each downward movement of the operating connecting rod, that is, two revolutions to each complete up and down movement of the treadle.

A is a portion of the frame of a machine upon which my device is supported.

B is a double crank shaft journaled in the frame and O is the drive wheel on said shaft for transmitting power from my device to the machine to be driven.

D D are two frames pivoted upon the pivot G G are bell crank leversjournaled in stationary bearings on the frame and pivotally engaging the ends of the levers F and F.

H and H are connecting rods connected at their lower ends to the treadle I, which has a pivot J slidingly secured'in a slot J in the bracket J 2 upon the floor.

The levers F and F are provided near their center with the substantially heart shaped enlargements K. At one end of these heart shaped enlargements are the cam' grooves L, which pass through the lever and beneath the upward extending flange or lips M. I preferably employ a spring N at the opposite side of the cam groove, but this may be dispensed with.

The parts being as shown and described, the operator placing his foot upon the treadle I presses down the outer end thereof, which through the connecting rod H will rock the bell crank lever G which will actuate the lever F and turn the crank. Through the connecting rod H and the bell crank G, the lever F extend on both sides of the cranks as shown, and the outer ends are provided with a forked bearing 0. As the lever F is brought into parallelism with the long arm of the bell crank G the bearing 0 on the end of the lever will engage with the fulcrum b on the swinging frame. Each fulcrum will be rocked into the path of said lever by the bearing of the head of the pin a. upon the heart shaped enlargement K of the lever. As the arm G continues its oscillating movement from the point of parallelism downward, the bearing 0 will be disengaged from its fulcrum pin and as the lever continues its movement, the pin a will engage beneath the lip M of the cam guide way L rocking the frame D, so that the lever is fulcrumed thereon and actuates the crank therethrough; the bell crank G and its lever F will be passing through the same moment will be correspondingly moved. These levers too as described for the lever F and when the operator presses upon the other end of the treadle, the mechanism will be actuated through sald last named levers in the manner described.

YVhere I use the two levers, as herein described, the fulcrums on each side of the cranks, on both frames, are moved in and out simultaneously. This will be understood by a reference to Fig. 4 where both fulcrums on the right hand of the cranks are shown in engagement with the levers, while the fulcrums on the opposite side are both out of engagement.

In Fig. 3 I have shown the parts with one of the cranks on the dead center and the other, 1t will be seen, is in position for operation. With this device I gear up from the treadle movement so as to get a complete revolution from the downward movement of each connectlng rod, and I distribute the application of the power evenly, or at four points around thewheel instead of at one point as in the ordinary crank action.

What I claim as my invention is- 1. In a device for converting a reciprocating into a rotary motion, the combination of a shaft, a double crank thereon, a lever pivoted on each crank, means for oscillating each lever, frames pivoted beside the cranks carrying fulcrum pins on opposite sides of the cranks, and means for alternately moving the fulcrums on opposite sides of the crank into the path of the levers, substantially as described.

2. In a device of the kind described, the combination of a double crank, levers pivoted on said cranks, levers for oscillating the crank levers, fulcrums, and means for alternately projecting the fulcrums into the path of the crank levers on opposite sides of the cranks, substantially as described.

3. In a device of the kind described, the combination of a double crank shaft, levers pivoted on the cranks, levers for oscillating the crank levers extending from opposite sides of the crank shaft, frames carrying fulcrums for each lever, means carried by said cranklevers for oscillating said frames to project the fulcrums on opposite sides of the crank alternately into the path of the levers, the fulcrums on both frames on each side of the cranks being arranged to be moved simultaneously into and out of their operative position, substantially as described.

4. In a device of the kind described, the combination of a double crank, levers pivoted on said cranks, levers for oscillating the crank levers, frames carrying fulcrums adapted to be projected into the path of the crank levers alternately on opposite sides of the cranks, said frames being actuated from the crank levers, substantially as described.

5. In a footpower, the combination of the cranks, the lovers pivoted in the crank, the fulcrums means for projecting the fulcrums into the path of each lever on opposite sides of the crank, the bell crank levers for oscillating the crank levers, the connecting rods H, H, and the treadle lover I suspended from the connecting rods and a bracket with which the treadle pivot pin slidingly engages, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

FRANCIS JACKSON.

Witnesses:

M. B. ODoeHERTY. N. L. LINDOP. 

